What is the approximate percentage of oxygen in the atmosphere?
Answer and explanation
Correct answer: Twenty-one percent
Oxygen constitutes approximately 21% of Earth’s dry atmosphere by volume. Nitrogen is the larger component at about 78%, while argon and other gases make up most of the remaining fraction. Hence option A is correct. The value is approximate because atmospheric composition varies slightly with location and because water vapour is variable, but 21% is the standard school-level figure.
Frequently asked questions
What is the correct answer to this question?
Twenty-one percent
Why is this the correct answer?
Oxygen constitutes approximately 21% of Earth’s dry atmosphere by volume. Nitrogen is the larger component at about 78%, while argon and other gases make up most of the remaining fraction. Hence option A is correct. The value is approximate because atmospheric composition varies slightly with location and because water vapour is variable, but 21% is the standard school-level figure.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting.
